Number of 4-ary rooted trees with n nodes and height exactly 6.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =0a(5) =0a(6) =1a(7) =5a(8) =19a(9) =61a(10) =175a(11) =469a(12) =1199a(13) =2961a(14) =7121a(15) =16784a(16) =38880a(17) =88832a(18) =200494a(19) =447897a(20) =991350a(21) =2176646a(22) =4744087a(23) =10272514a(24) =22109412a(25) =47325774a(26) =100786897a(27) =213634174a(28) =450844166a(29) =947545289